Precision Rounding Error

Definition ∞ A precision rounding error is a computational inaccuracy that occurs when numerical values are rounded during calculations, leading to a slight discrepancy from the true mathematical result. This type of error can accumulate over numerous operations, potentially causing significant imbalances in financial systems or smart contracts. Such errors arise from limitations in floating-point arithmetic or improper handling of decimal places. They can compromise the exactness of digital asset transactions.
Context ∞ Precision rounding errors are a subtle yet critical concern in the development and auditing of decentralized finance protocols. News sometimes reports on minor discrepancies or exploits stemming from these overlooked computational nuances. Ensuring precise arithmetic handling is paramount for maintaining the integrity of digital asset balances and preventing unintended value transfers.

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→Smart Contract Logic

→Exact out Swap

→On-Chain Forensics

Balancer V2 Stable Pools Drained Exploiting Precision Rounding Logic

The logic flaw in the Stable Pool's rounding function permitted batched-swap price manipulation, resulting in a nine-figure asset drain.

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→Protocol Security

→Stable Pool Drain

→Financial Loss

Balancer Protocol Drained by Compounding Rounding Error and Access Flaw

A subtle rounding-down error in swap calculations, combined with flawed access control, allowed the attacker to systematically drain over $100M from stable pools.

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→Asset Manipulation

→Systemic Risk

→DeFi Vulnerability

Balancer V2 Pools Drained by Precision Rounding Smart Contract Flaw

A systemic precision rounding error in the V2 Vault's `batchSwap` function allowed attackers to repeatedly drain liquidity via compounded, minute discrepancies.

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→Cross-Chain Asset Theft

→Smart Contract Audit

→Token Derivative Risk

Decentralized Exchange Pools Drained across Chains Exploiting Smart Contract Rounding Error

A critical rounding error in the batchSwap function enabled an access control bypass, leading to systemic, multi-chain asset siphoning.

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→Emergency Hard Fork

→On-Chain Forensic

→Stable Pool Vulnerability

Balancer V2 Rounding Error Drains over $120 Million across Multi-Chain Pools

A critical precision flaw in the V2 `batchSwap` function allowed invariant manipulation, compromising $120M in liquidity across major networks.

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→Access Control Bypass

→Asset Siphoning

→DeFi Vulnerability

DeFi Automated Market Maker Drained by Smart Contract Validation Bypass

A critical logic flaw in the V2 vault's internal validation mechanism allowed unauthorized batch swaps, compromising composable liquidity pools.

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→Token Withdrawal Function

→Automated Market Maker

→Liquidity Provision

Balancer V2 Pools Drained across Multiple Chains Exploiting Smart Contract Logic Flaw

A smart contract access control flaw in V2's `manageUserBalance` function allowed an attacker to bypass validation, resulting in over $128M in asset loss.